Valve for internal-combustion engines.



J. B; SEARS.

VALVE FOR INTERNAL COMBUSTION ENGINES. APPLICATION FILED FEE-2, 1910.

Patented Dec. 12, i911.

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, APPLICATION FILED FEB.2, 1910.

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Patented Dec. 12, 1911,

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Specification ofjietti's Patent.

Application filed February 2, 1910. Serial No. 541,529.

To all whom it my concern; Be it known that I, JOHN EDWARD SEARS, a subject of the King of Great Britain and Ireland, residing at Rydal Mount, Holders admission and exhaust compartments free.

Hill, Hendon, county of Middlesex, Eng.- land, architect, have invented certain new and useful Improvements in Valves for Internal-Combustion Engines, .of which the followin is a specification. This invention relates to rotary cylindrical. valves for internal combustion engines of the four stroke cycle type and has for its objects to simplify the valve con struction and improve the arrangement of the valve mechanism, to reduce the working parts and the driving power required to a minimum, to eliminate the probability of valve distortion and to enerally increase the compactness, reliability and efiiciency of the en ine.

According to the present invention the opening and closing'of the working cylinders of the engine to admission and exhaust is controlled by a short tubular valve working in a valve cylinder with open ends and divided by a partition into two compartments communicating with the inlet and exhaust ipes respectively through the open ends 0? the valve cylinder. The valve operates by. a motion of simple rotation, the valve gearing being mountedon one end of the valve in such a manner as to leave both of all obstruction, thus securing free ingress and egress for the gases. This construction and arrangement and the use of a short tubular valve materially reduce the p'oss1- bility of valve distortion.

The above arrangement may in some cases be modified by the provision of a fixed inner cylinder arranged in concentric relation to the valve cylinder so that the valve rotates between two cylindrical surfaces, the transverse partition being placed in the fixed inner cylinder instead of in the valve itself. The fixed inner cylinder may, if desired, be water-jacketed to protect the valve from the extreme heat of the gases and from corrosion.

In multi-cylinder engines the valve cylinder is preferably placed transversely to the line of the working cylinders so that one short tubular valve controls the admission and exhaust of two working cylinders.

In the accompanying drawings, in which similar parts are marked with like reference letters, Figure 1 is a sectional elevation Patented Dec. 12, 1911.

showing the application of one form of Fig. 2 1s a cross sectional elevation through the exhaust end of the valve showing the application of another form of valve to a vertical engine of the four stroke cycle type having two cylinders, the pistons of which move synchronously in the same direction. Figs. 3 and 4 are a cross sectional elevation through the exhaustend of the valve anda part sectional plan respectively, showing the application of the invention to a vertical engine of thefour stroke cycle type having four cylinders.

In carrying the invention into effect in one convenient manner, a single rotatingcylinder a, divided into two compartments 6 and o by a transversely arranged partition (1,

Arranged admission chamber 6 of the valve ais a suitably shaped port 9 while the exhaust.

chamber 0 is also provided with a suitably shaped port h. The valve cylinder f is' provided with two ports *5 and Z, with which the portsv g and h function to control the admission and exhaust respectively. The di viding wall separating the ports a and Z in the valve cylinder f may in some cases-be dispensed with, thus forming one port, the separate admission and exhaust ports in the tubular valve being retained.

The,valve cylinder f is in communication with the inlet pipe m at one end and the exhaust pipe n at the other end by suitable connections so that the compartment 11 of the valve communicates with the inlet pipe,

m and the compartment 0 with the exhaust pipe n.

The valve a is rotated from the crank shaft by any suitable gearing, a convenient form being a skew gear wheel g mounted on one end of the valve and surrounding the inlet pipe m and a similar gear wheel 7 gearing with it and carried by a shaft 8 driven by the crank-shaft by skew or'other suitable gear wheels. In multi-cylinder engines the shaft carrying the gear wheel r may be so located that the wheel r would drive two rotating valves. as shown in Fig. 4.

When a fixed inner valve cylinder t is employed as shown in Figs. 2 and 3, the transverse partition 0? is arranged in the inner valve cylinder instead of in the valve itself, and the inner cylinder t is provided with ports 0 and p which correspond with the ports '5' and Z'in the valve cylinder f, and

the inlet and exhaust pipes m and n are connected to the ends of the inner cylinder t.

Either the outer valve cylinder f as shown in Fig. 1, or the-inner valve cylinder t with its transverse partition or both valve cylinders as shown in Figs. 2, 3 and 4, ma be water-jacketed, the walls of the valve cylinders being constructed hollow and suitable water connections being provided for this purpose. I

When the exhaust ports Z are arranged as shownin Figs. 3 and 4, and the two cylinders fire in sequence, either the valve a or the fixed inner cylinder t as the case may be, is provided with a longitudinal partition or baiile-plate u to prevent back pressure in one cylinder from the exhaust of the other, and a bar or bridge '12 may be provided in the exhaust ort of the valve for the same purpose. Oilways and grooves are provided in the tubular valve and in the valve cylin- 'ders for the purpose of lubrication, which in itself is. a means for rendering the valves gas-tight. Additional protection against as leakage may be provided, if desired, by

orming grooves in suitable positions in the valve cylinders, in which grooves are fitted plates or bars resting on springs which exert a pressure causing the bars or plates to constantly contact with the tubularvalve.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. Valve mechanism for internal combustion engines of the four stroke cycle type comprising an outer fixed valve cylinder having ports communicating with the working cylinder of the engine, an inner valve cylinder fixed in concentric relation to the outer valve cylinder and provided with ports corresponding with the ports in the outer cylinder, and having open ends communicating with the inlet and exhaust pipes, a

transversepartition in said inner fixed valve cylinder, a short tubular valve rotating between the inner and outer fixed valve cylinders and provided with ports, and means for rotating the tubular valve from the crank-shaft of the engine.

2. Valve mechanism for internal combustion engines of the four stroke cycle type comprisl a fixed outer valve cylinder provided wit orts communicating with the workin cylinder of the engine, a water jacket or said outer valve cylinder, an inner valve cylinder fixed in concentric relation to the outer valve cylinder having open ends communicating with the inlet and exhaust pipes, and provided with ports corresponding to the ports in said outer valve cylinder, a water jacket for the said inner valve cylinder, a transverse partition in said inner valve cylinder, a short tubular 'valve provided with ports and rotating between the inner and outer valve cylinders, and means for rotating the tubular valve from .the crank-shaft of the engine.

3. Valve mechanism for internal combustion engines of the four stroke cycle type comprising a water-jacketed outer valve cylinder provided with ports communicating with the working cylinders of theengine, an inner water-jacketed valve cylinder having open ends communicating with the inlet and exhaust pipes, said inner valve cylinder being fixed in concentric relation to the outer valve cylinder and being provided with ports corresponding to the ortsin the outer valve '0 linder, a water-jacketed transverse partition inthe inner valve cylinder, a longitudinal partition separating two exhaust ports in said inner valvegcylinder. a short tubular valve rotating between the inner and outer valve cylinders, and means for rotating said tubular valve from the crank-shaft of the engine.

4. Valve mechanism for internal combustion engines of the four-stroke cycle type comprising a fixed outer valve cylinder provided with ports communicating with the working cylinder of the engine, an inner valve cylinder fixed in concentric relation to the outer valve cylinder having open ends communicating with the inlet and exhaust pipes and provided with ports corresponding to the ports in said outer valve cylinder, a water jacket for the said inner valve cylinder, a transverse partition in said inner valve cylinder, a short tubular valve pro vided with ports and rotating between the inner and outer valve cylinders, and means for rotating the tubular valve from the crank shaft of the engine.

In testimony whereof, I aifix my signature in presence of two witnesses.

JOHN EDWARD SEARS.

Witnesses:

' GEORGE TAPPING,

GEORGE 1. Burners. 

